Piston



` 0..H. SKINNER.

4 PISTON. APPLICATJON FILED ocT.4, 1920.

1,414,221'. Patented Apr. 25, 1922.

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@HAMEL H. SKENNER, OE ENDIANAPOLXS, ENDANA.

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Specication oi? Letters Patent. Patented Apr', 25, 1922. I

Application led October 4, 1920. Serial No. 414,515. l

To all whom t may concern: 4 Be it known that I, @HAMEL H. SKINNER, a citizen of the United States, residing at Indianapolis, in the county of Marion' and State of Indiana, have invented certain new and useful Improvements in Pistons7 of which the following is a specification.

My said invention relates to pistons for engines, and more particularly to the type of pistons used in internal combustion engines or motors and having a skirt or tubular portion, extending rearwardly from the piston head.

The object of my invention is to produce a piston which will be inexpensive, which will fit very snugly in its cylinder, without danger of scoring it, which will not rattle or chatter, and which will bear uniformly on the cylinder throughout its circumference,l

and when in use substantially throughout 'its length, said piston being designed par.

ticularly as an improvement on that disclosed in the patent toy Spillman 1,325,176,

Dec. 16, 1919.

which are made a part hereof and on which similar reference characters indicate similar parts, v

Figure 1 is an elevation of my piston,

Figure 2a similar elevation taken at a distance of 90 from Figure 1, d

Figure, a section on line 3-3 of Figure .1, and

Figure 4 an end View.

In the drawings, 6 denotes the head of' apiston of any preferred construction hav ing grooves 7 for packing rings as is usual. The tubular portion or skirtv 8 extends rearwardly from thehead'and has openings or bearings 9 for the piston pin as usual. This tubular portion has' transverse or substantially horizontal slits 10 and 11 and also has sgpiral slits 12 and 13 .cut therein as in the i pillman patent, but instead of cutting the slits 12 and 13 through the skirt throughout their length, thin webs 14 are left intact in the inturned rim 15 of the skirt.

The slits 412 and 13 are cut so as to have their'lower ends under or nearby under holes 9, and their upper ends connected with one end of'slots 1() and 11 respectively. They are also substantially spiral in direction, as

shown, and practically divide the skirt from the head, thereby preventing the rapid trans- .mission of heat Jfrom head to skirt and-.pro-

vidinga piston the extreme edge of the skirt vReferring to the accompanying drawings .two tongues 18 and 19, which are free in the Spillman device are held by the portions 14, 14 in my construction and so can expand only as a portion of the circumference of the piston. There are no free portions at the lower extremity of my skirt consequently chattering isr'educed to a minimum and the advantages of a solid structure are secured. As the heating of the piston is naturally greatest at the head and diminishes toward the lower endA of skirt, the piston may be practically non-expansible at its lower end and may approach in diameter veryclosely to the diameter of the cylinder without danger of binding in operation as the grooves will -provide for the contraction and expansion, or elasticity, vrequired by the variation in temperature during operation. I am enabled thus to attain the advanta eous results described in the patent and a so' maintain the piston of a fixed form and all parts integral at the lower end.

The piston may be made of aluminum or an aluminum alloy for lightness, this type of piston being well adapted to such ma" terial. l

My anti-chattering device may be modified in various ways, the scope of the invention being shown by the appended claims.

Having vthus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. A piston having a head and a skirt, said skirt having. transverse slits and s ral slits Aextending from the transverse s lts to the rear edge of the skirt, each side-of the. skirt thus forming oppositely extending tongues, the upper tongue being freely movable andy the lower tongue being permanently ixed at'its tip to the adjacent portion of the skirt, substantially as set forth. l

2. A n engine piston having a headand a skirt, the skirt having transverse slits adjacent to the head and spiral slits extending from said transverse slits to the rear edge of the skirt, said slits extending through the metal except at a point near t e edge of the Skirt'.

3. Apiston comprising a head, a skirt and an inwardly extending rim near the edge of my hand and seal at Indianapolis, Indiana, f

the skirt, said skirt having transverse slits this 27th day of September, A. D. nineteen 10 extending therethrough, spiral slits connecthundred and twenty.

ed to the transverse slits through the skirt l and to near its rear edge, the rtim embod GRAMEL H SK'INNER' [L S] ing connecting portions extending across t e Witnesses: spiral slits. J. J. -SWAN,

In witness whereof, I have hereunto set CRYSTAL GILPIN. 

